HeartSaVioR commented on issue #27191: [SPARK-30495][SS] Consider 
spark.security.credentials.kafka.enabled and cluster configuration when 
checking latest delegation token
URL: https://github.com/apache/spark/pull/27191#issuecomment-574336853
 
 
   > On a somewhat unrelated note (not to be addressed in this PR), does the 
producer side need checks related to delegation tokens expiring too?
   
   Once delegation token is updated, SASL_JAAS_CONFIG will be different which 
leads to initialize and use different Producer instance. I've updated it in doc 
as well. 
https://github.com/apache/spark/commit/eefcc7d762a627bf19cab7041a1a82f88862e7e1#diff-291798b0ad8f1d2c5c21dff52922e3d8R813-R814

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